John Adams, Charles Francis Adams (1850). “The Works of John Adams, Second President of the United States: With a Life of the Author, Notes and Illustrations”, p.131
John Adams' letter to Benjamin Rush (December 21, 1809), as quoted in "No, Mr. Beck, John Adams Did Not Think Governments Must Be Administered by the Holy Ghost" by Chris Rodda, www.huffingtonpost.com. June 16, 2010.
Massachusetts Historical Society, John Adams, Samuel Adams, James Warren (1917). “Warren-Adams Letters: Being Chiefly a Correspondence Among John Adams, Samuel Adams, and James Warren ... 1743-1814”
John Adams, Charles Francis Adams (1856). “The Works of John Adams, Second President of the United States: With a Life of the Author, Notes and Illustrations”, p.386
John Adams, Charles Francis Adams (1851). “The Works of John Adams, Second President of the United States: With a Life of the Author, Notes and Illustrations”, p.9
John Adams, Charles Francis Adams (1856). “The Works of John Adams, Second President of the United States: With a Life of the Author, Notes and Illustrations”, p.172
"A Defence of the Constitutions of Government". Book by John Adams. Chapter 3: "Marchamont Nedham: Errors of Government and Rules of Policy", Sixth Rule, 1787.
John Adams, Charles Francis Adams (1856). “The Works of John Adams, Second President of the United States: With a Life of the Author, Notes and Illustrations”, p.254
John Adams, Charles Francis Adams (1851). “The Works of John Adams, Second President of the United States: With a Life of the Author, Notes and Illustrations”, p.432